Line of Credit (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Line of Credit Facility [Line Items]
Interest expense	$ 1,295,000	$ 6,000	$ 3,000	$ 0	$ 311,000	$ 30,000	$ 1,000	$ 0	$ 1,304,000	$ 341,000	$ 0
Interest rate at end of period	2.40%								2.40%
Weighted average interest rate during the period									3.20%
Debt issuance costs									$ 5,382,000
Amortization of debt issuance costs									258,000
JP Morgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 250,000,000								250,000,000
Outstanding loans	105,000,000								105,000,000
Unused credit	$ 145,000,000								145,000,000
Interest expense									$ 969,000